The present invention concerns a medical device (10) intended to be worn by a human wearer, the medical device (10) defining a first area (26) and a second area (28), each area being intended to be positioned in front of a respective eye of the wearer. The medical device (10) comprises a frame (10), comprising a rear shell (34). The rear shell (34) defines a hole (54) facing the first area (26) and the rear shell (34) is opaque facing the second area (28). The medical device (10) also comprises an optical module (20) in the first area (26). The optical module (20) comprises a light source (70) and an optical system (72). The optical module (20) is arranged to send a light beam through the hole (54). The medical device (10) further comprises an electronic circuitry (18), adapted to command the optical module (20).